List of top Biology Questions asked in PSEB XII

List any four harmful effects caused by alcohol or drug abuse.
Give the characteristics of genetic code.
What is Human Genome Project? Why is the Human Genome Project called a Mega project?
State and explain Mendel's law of dominance with the help of an example.
What is Amniocentesis? For what purpose, it is used?
Define infertility. Explain any one assisted reproductive technology to check the problem of infertility.
What happens to the corpus luteum in human females if the ovum is (a) fertilised (b) not fertilised?
Define codominance. Explain the concept of co-dominance by taking an example of AB blood group in humans.
A woman carrier for haemophilia marries a normal man. Predict the possible genotypes and phenotypes of the offspring using a Punnett square. Also state percentages.
Distinguish between innate and acquired immunity.
Sex determination in honey bees is XX-XY type.
A child may have O blood group if his father and mother have A and AB blood group respectively.
Menstrual cycle ceases during pregnancy.
The lymphoid organs are the part of which system of human body?
What are primary lymphoid organs?
Name one primary lymphoid organ and one secondary lymphoid organ found in the human body.
Organic farming does not include chemical fertilizers.
Floral parts are un-wettable in case of hydrophilous flowers.
ELISA stands for ________.
During spermiogenesis, nebenkern of the sperm develops from ________ of the spermatid.
Cyclosporin A, which is used as an immunosuppressive agent in organ-transplant patients, is produced by the fungus named ________.
Coconut water is an example of a ________ endosperm.
The sterilisation procedure in males is called ________.
The number of megaspores formed from one megaspore mother cell is:
The cavity present in the blastula is called: